THORLABS KIM101 - Page 58

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KIM101 K-Cube Piezo Motor Controller
Fig. D.3 Open loop and closed loop control
The result of using closed-loop control is a linear relationship between demand
(voltage) and measured position – see Fig. D.4, in contrast to open loop control – see
Fig. D.2.
Fig. D.4 Closed loop response
amp actuator
demand
moving
part
open loop control
amp actuator
sensor
a + b/s
demand
moving
part
closed loop control
+
_
real position
demand position